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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 851 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Half of 26 =
  2. 2.Double 68 =
  3. 3.Double 26 =
  4. 4.Half of 154 =
  5. 5.Half of 68 =
  6. 6.Half of 138 =
  7. 7.Half of 126 =
  8. 8.Half of 108 =
  9. 9.Half of 174 =
  10. 10.Double 75 =
  11. 11.Half of 78 =
  12. 12.Half of 194 =
  13. 13.Double 21 =
  14. 14.Half of 192 =
  15. 15.Half of 158 =
  16. 16.Double 72 =
  17. 17.Half of 100 =
  18. 18.Half of 98 =
  19. 19.Double 76 =
  20. 20.Double 71 =
  21. 21.Double 65 =
  22. 22.Double 96 =
  23. 23.Double 18 =
  24. 24.Double 37 =
  25. 25.Double 41 =
  26. 26.Double 78 =
  27. 27.Double 51 =
  28. 28.Half of 90 =
  29. 29.Double 79 =
  30. 30.Double 83 =
  31. 31.Half of 114 =
  32. 32.Double 89 =
  33. 33.Half of 156 =
  34. 34.Half of 178 =
  35. 35.Half of 56 =
  36. 36.Double 36 =
  37. 37.Double 59 =
  38. 38.Double 43 =
  39. 39.Double 61 =
  40. 40.Double 91 =

Answer key

  1. 13
  2. 136
  3. 52
  4. 77
  5. 34
  6. 69
  7. 63
  8. 54
  9. 87
  10. 150
  11. 39
  12. 97
  13. 42
  14. 96
  15. 79
  16. 144
  17. 50
  18. 49
  19. 152
  20. 142
  21. 130
  22. 192
  23. 36
  24. 74
  25. 82
  26. 156
  27. 102
  28. 45
  29. 158
  30. 166
  31. 57
  32. 178
  33. 78
  34. 89
  35. 28
  36. 72
  37. 118
  38. 86
  39. 122
  40. 182

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